[Elecraft] K3 - Sub RX audio to right Line Out SOLVED

[Joe Subich, W4TV]

Mike's observations are the same as mine.  Using the XG-3 on 20 meters
and slow AGC, I see no change in audio output on left (Main RX) when
dual RX is enabled.  With dual RX enabled, both audio channels are
the same level.  MENU: LIN OUT is NOR 10. and MK II has RX Main/RX Sub
at the same point (12:00 for measurements/comparisons like this -
typically 10:00 for normal operation).

Windows Sound Control Panel - Recording Devices - Line (microHAM CODEC)
Levels tab line level is set to 40 and balance is set for 40 on each
channel.  Advanced tab |Default Format is set to: 2 channel, 16 bit,
48000 Hz (DVD Quality).

73,

    ... Joe, W4TV


On 4/30/2014 1:37 PM, Mike Harris wrote:
> Sorry Buck but it doesn't sound solved to me.
>
> I've been following this thread and have just for sanities sake done the
> following test:
>
> Line out = 7
>
> Main and Sub RX set to frequency of my XG1 (approx 7040kHz)
>
> XG1 set to 1uV out
>
> Spectrogram set to stereo input
>
> Windows sound mixer balanced L & R channel
>
> Both Sub and Main RX on CW both with 500Hz roofers and 400Hz DSP, both
> filter gain compensation setting 4dB
>
> Main RX level from Spectrogram = -82dB
>
> Sub RX level from Spectrogram  = -85dB
>
> If it turn off Sub RX, main RX level increases to -79dB
>
> Clearly there are measurement calibration issues here, I didn't inject a
> fixed level test tone into each of the L&R channels on the PC to check
> the balance.
>
> Never the less I would conclude there is still something very wrong with
> your line out.
>
> Regards,
>
> Mike VP8NO
>
>
> <snip>
> In the interest of future readers, here is what I found.
>
> I had the LIN OUT menu item set to NOR 10 as recommended.  In fact, they
> warn of going over that level.  However, when you turn on the SUB RX,
> the signal is split and you lose 3db.  This can be heard in the
> headphones.  It seems it also affects the Line Out.
>
> When I increased the LIN OUT level to 35, the Sub Rx could be heard in
> the right channel of the Line Out.  I have no idea how linear the LIN
> OUT level setting is but I suspect that increase to 35 is what was
> needed to overcome the attenuation that occurs when the Sub Rx switches in.
>
> Now the issue is, the output seems unbalanced with the Main Rx signal on
> the left channel of the Line Out jack being louder than the Sub Rx
> signal on the right channel.   I am able to compensate for this by
> turning down the Main Rx gain control on the MicroHam MKII.  I wasn't
> able to even them out with the RF Gain control on the K3 but I will play
> around with that some more.
>
>
> Buck
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